Scraper



l C. LE BLEU May 8, 1934.,

SCRAPER Filed Aug. 12, 195s 2 Sheets-Sheet 1 l'Ll INVENTOR Char/@5 e .f5/ew ATTORNEY May 8 1934- c. LE BLEU 1,958,195

SCRAPER Filed Aug. 12, 1955 @Sheets-Sheet 2 INVENTOR ATTORNEY rat-.nad May s, 1934 1,958,195

sommi Charles Le Bleu, Los' Angeles, Calif., assigner to Mack Wooldridge, Los Angeles, Calif.

Application August 12, 1933, Serial No. 684,847 14 Claims. (Cl. 37-126) The invention relates to `a scraper having a tute a longitudinally expansible strut mechabucket or pan which may be raisedand lowered. nism causing the frame to buckle.

The present invention has for its objects the The bucket B comprises side walls 24 and a provision of a scraper having a frame provided bottom wall 25 extending from the rear edge of with a boom adaptable to be operated forraisthe side walls tov a position short of the front. 60 ing and lowering and tilting the bucket; a scraper At the front edge of' the bottom is a digging lip having a gate for cleaning out the bucket and an 26. The bottom 25 is arcuate in shape, the side apron to close the front of the bucket in load Walls 24 overhanging portions thereof and being carrying position and to open the front in digsuitably braced cross-wise. A cross member 27 ging and clean-out positions; means to actuate of box form is secured to boom 12 and has pin- 65. the frame and hold the bucket in any selected tles 28 for pivotal mounting of the bucket on the position; and means to swing the gate and apron boom. The construction is such that onv extenso that in unloading the apron first uncovers the sion of piston rod 21, the boom\ 12 is elevated, bucket and the gate follows to clean out the raising the bucket bodily and tilting the digging bucket.

These objects are Yaccomplished by the emrod y21 the boom is lowered, the bucket bodily bodiment of my invention illustrated in the aclowered and the digging lip tilted toward the companying drawings, in which:- ground. Various positions are shown in Figs. 1,

Fig. 1 is a side view of a scraper with bucket 3 and 4.

in load carryingposition; Fig. 2 is a fragmentary Upstanding from the bucket side walls 24 and 75. plan view of the structure shown inl Fig. 1; Fig. xed thereto are trusses 29 having journals 30 3 is a side elevational view of the scraper with at the upper ends. The trusses serve for hanging parts in digging position; and Fig. 4 is a side the gate C thereon. Pivotally mounted on the4 sectional view of the scraper ,with parts in dumpjournals are arms 31. The journals 30 and arms ing position.

Referring more particularly to the drawings, a extending between the arms and fixed thereto, frame A is provided witha front axle 5 having the hinges being concentric with the arcuate botwheels 6 journalled thereonV forming a front tom 25. Brackets 33 are secured to gate plate truck. A draft tongue 7 provides for connection 32 and secured thereto by a wrist pin is a piston of the scraper to any suitable means for drawrod 34 having a piston working -in hydraulic 85 ing it along the ground, such as a tractor. The cylinder 35. The standards 15 serve as beardrait tongue may be secured to axle 5 by any ings for trunnions 36 which pivotally support cylsuitable king pin structure 8. Mounted on the inder 35. It is apparent that gate plate 32 may axle isa stub shaft 9 and journalled thereon is serve as 'a back wall for bucket B and, maybe l a bearing 10 formed on an arm l1. The arm swung to sweep from one end of the bucketto the 90 11 is a portion of a boom 12 extending toward other. the rear of frame A. An axle 13 has rear Brackets 37 are secured to the side walls 24 of ground wheels 14 journalled thereon forming a the bucket and support pintles 38 at their upper rear truck. Standards 15 are supported on axle ends, upon which is hung an apron D. Apron 14, and ranging forwardly therefrom are bridles side plates 39 are pivotally mounted one pintles 95 16 secured to the side walls of bucket B. The 38. Extending between plates 39 across the bucket bucket may have suitable stiffening members is an apron front plate 40 of scoop form with its such as angle irons 17. Secured to the bucketv rear .edge adapted to be engaged with bottom at its lower end and to axle 13 are braces 18 furplate 25 of the bucket. Pivotally secured to apron ther :dxing the bucket to axle 13.' -A hydraulic side plates 39 arev connecting rods 41 secured by 100 cylinder 19 is secured to axle 13 by means of pivot pins 42 to crank arms 43 connected to a brackets 20. Within the cylinder 19 is a piston crank shaft 44. At the center of crank shaft 44 having a piston rod'21` which is'pivotally secured is a crank arm 45. Mounted on trunnions supto boom 12. Hydraulic conduits 22 and 23 may ported by standards 15 is a hydraulic cylinder 46 lead to any suitable sburce of hydraulic pressure with convenient valve control whereby uid unpin secures piston rod 47 to crank arm 45. Upon der pressure may be directed to one or the other outstroke movement of piston rod 47, the apron end of cylinder 19 and cause its piston .to be D will be swung away from the front of the moved so as to raise or lower the boom. The hy-. bucket and on instroke toward the bucket to draulic cylinder 19, its piston and rod 21 consti- ,close thelatter. 110

Iip 26 upwardly. On contraction of the piston 70 i 31 constitute hinges supporting a gate plate 32 80 having a piston and a piston rod 4'?. A wrist 105 Cylinders A and 46 are connected to the same hydraulic conduit and the hydraulic mechanisms are double acting. Referring to the connections of cylinder 46. At the rear end of cylinder 46 is a conduit branch having a check valve 48 permitting free ingress of liquid. Another conduit branch is connected to the rear of cylinder 46 and has a spring loaded check valve 49 permitting egress of liquid after a selected hydraulic pressure has been attained. The conduit branches are connected to a common conduit 50 which has therein a T fitting 51 with a leg connected to cylinder 35. The front end of cylinder 35 has a conduit 52 connected thereto and the front end of cylinder 46 has a conduit 53. Upon the conduits 52 and 53 being connected to a discharge for liquids from the cylinders 35 and 46 and conduit 50 to a source of liquid under pressure, both the pistons of cylinders 35 and 46 will be moved outwardly and the apron D moved away from the front of the bucket while gate C will be swung forwardly through the bucket. Upon conduit 50 being connected to discharge, and .conduits 52 and 53 being connected to the same source of uid Il under hydraulic pressure, the piston in cylinder 35 will first b e moved inwardly and gate C to the rear of the bucket. When the piston of cylinder 35 has reached the end of its stroke, pressure will build up sufliciently to mov e the pistonfin cylinder I46 inwardly against the action of spring loaded check valve 49 and the apron is swung to close the front of the bucket. It will thus be seen that in operation of the gate C and apron D, the gate C attains its rear position before the3 apron D closes. The same operation might be obtained by other mechanical expedients instead of the spring loaded check valve 49. Proper proportioning of sizes of cylinders 35 and 46 or of the crank arms 43 and 45, or both, will produce the eil'ect, and I have herein shown one specific means to attain the result as illustrative of this broad feature.

In Fig.l 1, the parts are shown in load carrying position. Dirt within bucket B is held from loss by the apron D. When it is desired to dump the load, the boom is raised, tilting the bucket with its nose downwardly. Hydraulic pressure is then introduced to the rear of cylinders 35 and 46 by conduit 50, and conduits 52 and 53 connected to discharge causing the apron D to be swung to open position and gate C forwardly to sweep the' dirt forwardly out of the bucket B.

Hydraulic pressure may then be reversed and introduced through conduits 52 and 53 while conduit 50 is connected to the discharge. Gate C will then be swung to the rear of the bucket and then fluid may be maintained static to hold the gate C at the rear of bucket B and apron D open. Boom 12 is then lowered to cause digging lip 26 to enter the ground and by forwardAmovement of the scraper dirt will be caused to enter the bucket. After the bucket is loaded, further hydraulic pressure is exerted through conduits 52 and 53, and cnduit 50 connected to the discharge to cause closure of apron D. The boom may then be elevated to tilt the front of bucket B and raise it bodily from the ground to carrying position.

It will be noted that I have shown a front truckle axle 5 and wheels 6. It is apparent that the front end of boom 12 might be supported on the rear of a tractor, the latter constituting a truck. g

What I claim isz- 1. A scraper comprising a frame, trucks supporting said frame at the front and rear, and a bucket open at both ends mounted on said frame between the front and rear thereof; said frame having a boom supported at one end on one of said trucks, a longitudinally expansible strut mechanism mounted on the other of said trucks and supporting the other end of said boom, means to expand and contract said mechanism whereby to selectively raise and lower said boom, said bucket being secured to said other of said trucks, 4and a pivotal connection securing said bucket to said boom whereby the said bucket may be tilted downwardly toward digging position or raised to carrying position.

2. A'scraper comprising a frame, trucks supporting said frame at the front and rear, and a bucket open at both ends mounted on said frame between the front and rear thereof; said frame having a boom supported at one end on one of said trucks, a hydraulically expansible chamber mounted on the other of said trucks and supporting the other end of said boom whereby to selectively raise and'lower said boom, said bucket bei/ng secured to said other of said trucks, and

a hanger securing said bucket to said boom whereby the said bucket may be tilted downwardly toward digging position or raised to carrying p0- sition.

3. A scraper comprising a frame, trucks supporting said frame at the front and rear, and a bucket open at both ends mounted on said frame between the front and rear thereof; said frame having a boom supported at one end on one of said trucks, a hydraulically expansible chamber mounted on the other end of the frame and supporting the other end of said boom whereby to selectively raise and lower said boom, said bucket being secured to said other of said trucks, and a pivotal connection securing said bucket to said boom whereby said bucket may be. tilted doWnwardly toward digging position or raised to carrying position.

4. A scraper comprising a frame, trucks supporting saidframe at the front and rear, and a bucket open at both ends mounted on said frame between the front and rear thereof; said frame having a boom supported at the front truck, a longitudinally expansible strut mechanism mounted on the rear truck and supporting the other end of said boom, means to expand and contract said mechanism whereby tol selectively raise vand vlowersaid boom, the rear of said bucket being secured to the rear truck, and a pivotal connection securing said bucket adjacent its front end to said boom whereby the front end of'said buck- 130 et may be tilted downwardly toward digging po- -sition or raised to carrying position.

5. A scraper ,K comprising a frame, trucks supporting 'said frame at the front and rear, and a bucket open at both ends mounted on said frame between the front and rear thereof; said frame having a boom supported at the front truck, a hydraulically expansible chamber mounted on the rear truck and supporting the other end of said boom whereby to selectively raise and lower said boom, the rear of said bucket being secured to the rear truck, and a pivotal connection securing said bucket adiacent its front end Vto said boom whereby the front end of said bucket may b e tilted downwardly toward digging position or raised to carrying position.

6. A scraper comprising a frame, trucks supporting said frame ati the front and rear, and a bucket open at both ends mounted on said frame betweenv the front and rear thereof; said frame having a boom supported at the front truck, a

hydraulic cylinder and piston mounted on'thek rear truck and supportingthe other end of said boom whereby to selectively raise and lower said boom. the rear of said bucket being secured to the rear truck, and a pivotal connection securing said bucket adjacent its front end to saidV i mounted on the rear truck and supporting the. other end ofssaid boom, means to expand and contract said strut mechanism whereby to selectively raise and lower said boom, the rear of said bucket being secured to the rear truck, a pivotalv connection securing said bucket adjacent its iront` end to said boom whereby the front end of said bucket maybev tilted downwardly toward digging position or raised to carrying position; a gate adaptedto be moved lengthwise'of said bucket from end to end, and hydraulic meansmounted between said frame and bucket to move said gate., 8..A scraper comprising a frame, trucks sup-v porting said frame at the front and rear, and

t a bucket open at both endsmounted on said frame between the front and rear thereof; said frame having a. boom supported at the front truck, a hydraulically expansible means mounted on the rear truck andjsupporting the other end tof said boom whereby to selectively raise and lower said boom, the rear of said bucket being secured to the rear truck, a pivotal connection vsecuring said bucket adjacentl its front end to said boom whereby the front end of said bucket may, betilted downwardly toward digging position or raised to carrying position; a gate adapted to be moved lengthwise of said bucket from end to end, and a hydraulic means mounted between said frame andbucket to move said gate.

9. A- scraper comprising a frame,'trucks supporting said frame at the front and rear, and a bucket open at both ends mounted on said frame between the front and rear thereof; said frame" having aboom supported at the front truck, `a hydraulic cylinder and piston*l mounted on' the rear truck and supporting the other end of said boom whereby to selectively raise and lower said boom, the rear of said bucket lbeing secured to `|`the rear truck, a pivotal connection securing said 'bucket adjacent its front end to said boom whereby the frontend of said bucket may be tilted downwardly toward digging position or raised to carrying position; a gate pivtally supported on said bucketand adapted to be swung lengthwise of said bucket (from end to end, anda second hydraulic cylinderand piston mounted between said frame and bucket to swing said gate.

l0. A scraper comprising a frame, trucks supporting said frame at the front and rear and a bucket open at both ends mounted on said frame between the front and rear thereof; said frame having a boom supportedatrthe front truck, a hydraulic cylinder and piston mounted on the rear truck and supporting the other end of said boom whereby to selectively raise and lower said boom, the rear of said bucket being secured to the' rear truck, a pivotal connectionl securing said bucket adjacent its front end to said boom whereby the front end of said bucket may be tilted downwardly toward digging position or raised to carrying position; agate pivotally supported on said bucket and adapted to be' .swung lengthwise of said bucket from end to end, a second hydraulic cylinder, and piston mounted between said frame and bucket to swing said gatefan apron pivotally supported at the front end of said bucket'for swinging movement to and froml the bucket, a lthird hydraulic cylinder and piston interposed between ,said frame and said apron for actuating the latter; and a hydraulic conduit connect# ing said second and third cylinders for-simultaneously subjecting their pistons to hydraulic" pressure.

11. A scraper comprising a frame, trucks supporting said frame at the front and rear, and a bucket open at oth ends m nted on saidframe between the iroawgeusaid frame having a boom supported'a the front truck, alongitudinally expansible strut mechanism mounted on the rear truck and supporting the other end of said boom, means to expand and contract saic'k strut mechanism whereby to selectively raise and. lower said boom, the rear of said bucket being secured to the rear truck, a pivotal connection securing said bucket to said boom whereby thefront end of said bucket may be tilted downwardly toward digging position or raised to carrying posiy tion; a gate adapted to be moved lengthwise of said bucket from end'to end, a hydraulically expansible chamber mounted between said frame `and bucket to move said gate; an apron forthe front end of the bucket for movement to and `ffrom the bucket, hydraulic means interposed be-` tween said frame and said apron for actuating the latter; and a hydraulic conduit'cnnecting said chamber and means for simultaneously subjecting them to hydraulic pressurefl f 12. A scraper comprising a frame, trucks supporting said frame at the front and rear, and a bucket open at both ends mounted on said'frame between the front and rear thereof; said frame having a boom supportedatthe front truck, hydraulic mechanism mounted on the rear truck and supporting the other end of said boom whereby7 to selectively raise and lower said boom, the rear o said bucket being secured to the rear truck, a pivotal connection securing said bucket/to said boom whereby the front end of said bucket may betilted downwardly towardl digging position or raised to carrying position; a gavte adapted to be moved lengthwise of saidbucket from' end to end, a hydraulically expansible chamber mounted between said frame and bucket to move said gate; an apron for the front end of the bucket for movement to and from the "bucket, hydraulic means interposed between4 said frame and said apron for actuating the latten-and a hydraulic conduit connecting said chamber and ymeans for simultaneously subjecting 'them to hydraulic f pressure. y

13. A scraper comprising a frame, trucks supporting said frame at the front and rear, and a bucket open at both ends mounted lon said frame between the front and rear. thereof; said frame having a boom supported atthe front truck, a hydraulic cylinder and piston mounted on the rear truck and supporting the other end of said boom whereby to selectively raise and lower said boom, the rear of said bucket being secured to the rear truck, a pivotal connection securing said bucket to said boom whereby the front `end of said bucketL may be tilted downwardly toward digging position or raised to carrying position; a gate 'adapted `to be moved lengthwise of saidI 4 l, f bucket `from end toend, a. second hydraulic cylindei' and piston mounted between said frame and bucket to move. said gate; an apron for the front end of the bucket i'or movement to and from the bucket, a thirdhydraulic cylinder and piston interposed between said frame land said apron for actuating the latter; and a hydraulic conduit connecting said second and third cylinders for simultaneously subjctmg' their pistons to nydraulic' presure. J A

14. A scraper comprising a frame, trucks supporting said frame at the-front and rear, and a bucket opi-'n at both ends mounted on said frame between'the front and rear thereof; said trarne having a boom supported at`the front truck, a

hydraulic cylinder and piston mounted on the rear trucky and supporting the other end of said boom whereby to selectively raise and lower said boom, the rear or said bucket being secured w the rear-truck; a pivotal connection securing'said bucket adjacent its frontend to said boom whereby the iront end of said bucket may be tilted downwardly toward dlssin position or raised to carrying position; a gate pivotally supported on said bucket and adapted to be swung lengthwise of said bucket-from end to end, a second hyinders for 'simultaneously subjecting their pistons to hydraulic CHARLES LE lao' 

